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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf55585db76f7ade69319663cb3b3ab8c5ca1125d678bca790d78157054ce1f6' 
  AND token = 'CjzHbrc41OMhHIOrE2yKbKwZ+5+Gs1aKrbyp1smzI30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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