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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b312a46732d57a4f7e5d267f5b0cbcffe19d84996f59a36e8d203dcaf1a80bf9' 
  AND token = 'jnhHWdswStphzREMI832NVH8WlPn1tD1bvh+KOU75ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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