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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44994a7d9cdd0c5ec997622e19550327057ca853323147d83d084a0bdf81a56' 
  AND token = '3PDmYM+5bd6LOZL8kttvBcVfSgPWCOeilor4aXI80Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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