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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7a8c6ba0ad74fab36d3e1c65986ef866e9829ae10c6ed09fa74d5fc5452bc5' 
  AND token = 'Wyq0RpdDW8WHnAIl61X3NEGS4VLpDzP3aCETfdt1Mhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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