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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3edad83d758f46b8661e56b27e3df6c3194f494d411f09b7fb237bf538737a40' 
  AND token = '9fk0j/f9lPHb+j6+mtHUEYA4D7oQOiolPiV2QHPEqGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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