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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59756979c624b0d4c2bc56dec78fc044a870470b89831b9e776f49c9325d6489' 
  AND token = 'wkmmBpiOa8MMeeeXb8vx5HjOzowwTZUOp10f8w1fqK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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