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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0bf67a02b2582d16cb459afc2f543dd6ad83526ddd059d29bd18e0cbcf14828' 
  AND token = 'FWM941rg59YMgMxQ83gRs0SqXIuiiVzEhIzqYuxOZp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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