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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2034f44699202e63ffba4e0b502b9c3ed7b516db9c05295f95e5b0920eb697d' 
  AND token = '4CSobAqjBIb2FyOqSUVpzIC7CSrfWLlGdVjKoFym1mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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