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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15e9a54f010ebb7a82311036bed6f01a37960a8358260c25bc6670b911fd50a' 
  AND token = 'RLe6P8vLuGfBwkm7av1ulrHNSZctFyePX/tWeFj1yi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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