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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55c7398426c9c884fbf4f3e679e73654098acbc3d4f4ada88ab22123b2f7118' 
  AND token = '3smuH/R7bcgOK5YCmRFo7U58SVrWk4YBTtXjY19VfM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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