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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a7758447c3c5e95658d13f1d9b3bb54ca4ac0114ef32717cb72fe7d650296e' 
  AND token = 'VfC16qBNPTW1QB7fyM4C4aqp7vznL4rXezCw+vn1Mg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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