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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ced692dc6fac91c3aadef48017c2ac5e8db47b9a1f2f83947060d3667eef6a' 
  AND token = '47k5ZeCVOkOVj3EKZT5g3TLwVNzMYEJZtDR/0t4hYJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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