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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204f500d19335019538f0bc56c10bf8e18e87df3a0005c6c6d26b2df6d5e6867' 
  AND token = 'LD0GtXVwBsGTUR8AXux8ZGlEn8ecXpgiLZa9Mi8RsGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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