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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88dd360fa9b10c6203505d7201967d26859f19a6ab28c5a802c0d2e7e5613ea' 
  AND token = '+DDzdY6dEulyhEzYuftbyhl37oQtgoCr8le4tHsvGh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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