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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7bd907bdb6c95f880520e31038bb75b0c169c97dce42115ebe0406476ec1ac2' 
  AND token = '04hhZfR7MFfQFWA4qvTo3jS44tp0/DmWzTN/7WzC1fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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