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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c802c5c2c3f46584e40d05bb9804b573306b56b1772cdd0af241e356e4f4150' 
  AND token = '/5rNadPXc856rJO1U5bkHIGj578FzRLvoxYR6AKtkas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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