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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05ba69800da9d3f7334307f43a48cc6dd13e3d13a01ad70743e11583f2a8adb' 
  AND token = 'lzfh71lR7Q7uthgyA6wG+JVfJbGLKi6GU0KGEsgtbn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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