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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32bd1f3416328cc4075faf2926a5070d318161ed916fa622f4e02f33cdfe218' 
  AND token = 'W74I+v7+7lJVdfOZu8VT0vvm2cVLOEUBFH2s+bmjHB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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