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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1527c564754befac7a44c7e11bb770b255576ee6e40c52f321037b199e031879' 
  AND token = 'P8D4H0qfvPEb4zXFkrljckA/KZ/YuDRUQ8y2t/vq4HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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