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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f53cdf7428e545f560238f420f59f341b12555a6530dba9dbebc9cbbf1eb93' 
  AND token = 'y564wNVe62/9hUpADW87u20Ko6yQ7m/P/LIXXRI51EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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