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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd900f751a151368927e7110691fe0aa95a3975bbf231469fd53413f85d042a8' 
  AND token = 'AWGO6CtUIw7q/3GGixqM8Z4nf/KAC4jm7EYGqdLmSwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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