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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b670fa0f49762f23eaa54a256a8e4c08a876667dc26a7ca86254ac7eb364ab0c' 
  AND token = '/JYrduTCu3Cpkn2uLaEbvwAh18/fckkq+KGtAFrtz9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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