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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60aad64ef475218bf527e9555a17b18abfa5012b6c134d2905eed20f3cac034b' 
  AND token = 'E8gGdvl7tdnwW6ZDm1qLS5xd76oTVNSATZp+Ol2H800=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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