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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e620ec8540979218508fa1f8811c7c6eedcd97f9e98ecdf55d9a3828e29b0c4' 
  AND token = 'ohC9KshV91dFXyYyqbIPK1opudvpIYKycokacBmKzCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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