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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09885d368e53ea846d37c97fa6a096755d5310ea3ed7f51fd2912adf9c11cf32' 
  AND token = 'm1lqlzEV1lpCMrxwbahGtErFZoRs/oN3pqoLtKA1leE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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