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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8d05bbc230da6c07617c97f9b95f91115ce3c5aeeacc05dc92d6e58de232a8' 
  AND token = 'H3nudqh+KWtIIunhctg2MO11oNPrbL57jX918WbBN6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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