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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736391f379b16ff56bccc03e0f5ef41fd8788ea562bc3722deef12a59a395620' 
  AND token = 'Nc1wpXYQwRkAVJPlRuSIRTfcWcvXKZijRpKFCbb8JrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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