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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7540cb04eabe0c6e716ea461d9e86ee086e7852323ad664f631bab09a75d1060' 
  AND token = 'IqErPRPlA/MDZSoaeG4MOHru1lccw+W2MPxQgb9u3aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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