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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523eefa663a90f2fb641ef4084b889a7d79c0f55dce8758e51927f9775a3b264' 
  AND token = 'neMAoTLIIGGpD6vX2OMY9GnGRan3rcz8PQp+/lCgHI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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