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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5fb90d7e0f666139c322c9e6a137780ecf86cb73225988ce83c77cc7ddc79ab' 
  AND token = 'zTFpYoDPvewwD9f5B6GeDGJJ9bugVs8pw2SNuIokjO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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