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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa71acfa0ceaebdf3f767ca5d949df8c7370fef81cbfe9880739b0e01a7bdbc2' 
  AND token = 'dyYY0dbiL2oAvTKzWqI2+tapvu6PFtowBd71Vh3sBTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}