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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0197661a87f92114e878779f1133fc8e5c437080a45c334904a4d1b2d18c9dcf' 
  AND token = 'ssEdIVDuvYlX2KMTpsvZ+bEHZ+hJNEWKu0O8Wcq6EkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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