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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843579363af1bc92c21c832ae6f7edb658e73b82e86294567bb248f02537a60e' 
  AND token = 'VfuvMIgt/1f+Ag2q62k8ZkDGi0H6JxcmfNAlEHx1P98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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