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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5667ba37944e0749cceac7c47515ea94000b0fed617f43a535cf127a6d060dc1' 
  AND token = 'yd0/71yGsZzW9ItILP7be4sIhJO7q4KwnVsPdeDid1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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