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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f4fadf01b3f085f041c13be6066e0f27652a95e2e9ff015cbf99bc2c85b2198' 
  AND token = 'vSGYslWnPpOcnHlOqcZzdr+rf1r4g3wg/emrDaPil4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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