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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955c7803de525f13518216cb83e7caef1bb354da1c40219ab2062ea34bbbfb5e' 
  AND token = 'R+egZBseHlrFEyuigxess+XUKuvsz0m9DoOepFit7qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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