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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec289adcfd46e34d8a4de0427b137a985642665b53b2a601da2c83053d836942' 
  AND token = 'Kmxe46/U8wEhWnU4Jz1SLFJM4mWQ4rgyWLHAhcgVCCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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