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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e156aa3d389d9ffa441e43cbdc6d4d5857d1547f36054f6d0214794fd569e2' 
  AND token = 'L2nx21Plk5qF2Dxy+1Qa0oe0KRG+9r/RyGSwJDLXqqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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