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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53398fa05d21302dbf2f98169432382684fb7e17a36fa4a046da380de83171fc' 
  AND token = 'p7hWisOSVMjxwYtW+tQShfX+VEI1KU6yunxcWw99IJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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