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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef7b1eb3dfc2f32df6e9f2683308ffc7397bcc4bfd8d1e40434b2ac098bf62b' 
  AND token = 'JWqFE9ahYYpzbSY2vCH058f4vwI7sfrMVn1tRKTap1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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