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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afaadc49a2bce7695c5d82e9fa43fc42b650453fa63707c5bdc1a578ca0bbf9d' 
  AND token = 'FnFL9f979pCRxcNBAJyJrJ4mfLX5vF8ujoauOB8ri2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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