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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f83df498c33cdcec87ae3dfe8c89edf63c3b63297eb453749b9d2f8eff7d0d4' 
  AND token = 'p85IxhJC1lozFYgvrFfhlgEtOS+fQg5Q2yxqJf34KLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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