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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebf0f8244c9d3100ab74564d22b29e4730ad0787860d16bc2036ba66a0a7494' 
  AND token = 'wv2Tlu2TeT2edqXHOwpoly6rpIj/2XOVwuIjDLMy50E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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