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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb1a9b02d7a344ce69d4077eff7fe756ba64151f8e50c1e96f7b4fcd83d0d79' 
  AND token = 'vOJeIBa19yCF+bTeEKQIFzOF4LEJsg0Yz1q+lKGF+mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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