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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda39301aac04e9c37c8c4be56981b99ba984984679339d54e87774e005f8785' 
  AND token = 'KJwmo0mV1lTRDvNHyj6rPo9kSvInmuFbD1d0+9fv6e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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