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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f5dfab6e05fa534b2eadf4a8d8941a947a19e7f2e81eedc35084df27971cb5' 
  AND token = 'ldCoicYprKxKYvFwHKBoUUgLEpWXK1je5QEy369fndQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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