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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4caebc572f2085d96a993dd6cf0b0efbfdc9d7244a2925b7d7b4ed5a7c52c9e' 
  AND token = 'vxdJohaT3bkzt7p8xbSsbXh4Ff6d1TNMYo6tGtU35PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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