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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c382739b1d64905f35cf8a919c0d6fdcd6d7e2a1841267df584bfda415096a' 
  AND token = 'KeUJEUX08aTOhbV7MAOkN0/fXdy92/DUPv2xN1/N/DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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