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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becc69c5ac57971b027c8d530aa406f14c8080e61e790d762c8dad10694a443c' 
  AND token = 'PHQR4cXi7JbQ15ur12xxF3S4dWl0CsuZUxHw+0Nte80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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