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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02f4f35fc272090b7eaadf7dae52636a0fbb9a3c4f80bf4cb1fba74183c88ca' 
  AND token = '0zKw0fpkTvFVCO53g7I+T2FiVbL9a3dTZ3iKggzXDVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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