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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9e27d866c377b5b702ce3d1802e52754145004c00cd0348a991c800afb796e' 
  AND token = '0FlmmzPtZrZ5Ji6D20HWZaZX5TIq5vMBIfAQTnaikcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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