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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6dc7b411b0fbace0bdeeeb526b23a359666eadd6801e22d0de392bcf14c0f2' 
  AND token = '6svFHNDZ6AUWXSwwQ23XD1LjPIID1s/F+N4EF/V5rvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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